Windrush.
Idi Amin.
Enoch Powell's "Rivers of Blood" speech.
The effect of black and asian culture on fashion, music and pretty much everything else.
The rise and fall of the National Front and Rock Against Racism.

much/little you already know about this (so don't want to patronise you) but things like the Notting Hill race riots in 1958 are sort of landmark events (and Oswald Mosely used them as an attempt to re-enter politics in GB, thus tying in nicely with some pre-war extreme right-ism...)

but i think it has also been mentioned about how the far right is thrown into the mainstream by the media (front page BNP stories etc), i'm a bit confused really. There seem to be a number of ways i can tackle it